Crossword Genius

Speed up Bletchley Park genius, providing support (9)

Ross

I believe the answer is:

nurturing

'providing support' is the definition.
(to nurture something is to support it)

'speed up bletchley park genius' is the wordplay.
'speed' becomes 'run' (running is a kind of speeding).
'up' is a reversal indicator (in down clue: letters go upwards).
'bletchley park genius' becomes 'Turing' (mathematician Alan Turing).
'run' in reverse letter order is 'nur'.
'nur'+'turing'='NURTURING'

(Other definitions for nurturing that I've seen before include "Rearing; cherishing" , "Training up" .)

I've seen this clue in The Times.
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